New start date of Fall 2020 semester.

Dr. Manohar Kumar
Research Fellow
Department of Applied Physics
Aalto University, Finland

Particle collider in condensed matter physics for Anyons

Two-dimensional systems at low temperatures and at high magnetic field, can host exotic particles with elementary excitations carrying fractional charge e* = e/q such as in fractional quantum Hall effect 1 . These exotic particles are called anyons, whose quantum statistics are neither bosonic nor fermionic; instead they are predicted to obey fractional statistics 2 . The fractional charge of these anyons has been studied successfully using low frequency shot noise measurement 3,4 . However, no universal method for sensing them unambiguously exists 5 . Also, clear signature of the fractional statistics remains elusive. Here we exploited the Josephson relation of these anyonic states to determine the fractional charge of excited quasiparticles. The microwave photons emitted by voltage biased anyonic system obey the Josephson relation, like superconducting Josephson junction but with the charge q = e* rather than 2e. This provides    direct evidence of fractional charge in fractional quantum Hall effect 6 . Lastly, we also probed the fractional statistics in mesoscopic anyonic collider 7 . Our collision results explicitly extract the quantum phase of \phi = pi/3 for exchange of two anyonic quasiparticles with q = e/3. This is very first smoking gun result on fractional statistics of anyon. This collider geometry could be extended to perform ultimate braiding experiment to realized full potential of special kind of anyon called non-Abelian anyons in topological quantum computation.…

Prof. Onur Erten
Department of Physics, Arizona State University

Theoretical study of superconductivity in square-planar nickelates

Abstract forthcoming…

Prof. Peng Wei
Department of Physics
University of California Riverside

Signature of a pair of Majorana zero modes in gold

Proximity effect in multilayer heterostructures allows the creation of new quasiparticles with mixed physical characters. In particular, it may lead to the emergence of Majorana zero modes
…

Polaron-Plasmon Superconductivity in Strontium Titanate

Alex Edelman
Graduate Student
Department of Physics
University of Chicago

Abstract forthcoming…

Title TBA

Prof. Ilija Zeljkovic
Department of Physics
Boston College…